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What is the correct way to charge gas in a tube furnace?

What is the correct way to charge gas in a tube furnace?

1. Connect the hydrogen pipes and use soapy water to check for leaks at each joint to make sure there are no leaks.
2. Verify that the valve is closed.
3. Turn the knob counterclockwise to open the main valve of the hydrogen cylinder, turn the knob clockwise, and slowly open the outlet pressure relief valve to make the outlet pressure 0.1 MPa.
4. Connect the power of the mechanical pump, open the outlet valve of the tube furnace and the two valves on the air channel of the mechanical pump, and pump out for 5 minutes.
5. Close the two valves on the air passage of the mechanical pump, close the outlet valve of the tube furnace, and then turn off the mechanical pump.
6. Open the upper airway control valve counterclockwise so that the arrow points to the "open" position.
7. Adjust the knob of the flow meter counterclockwise so that the indicated value is 20 ml/min.
8. Turn the knob counterclockwise to open the inlet valve of the tubular chamber furnace until the barometer reads zero.
9. Open the inlet valve of the tube furnace and the red outlet valve on the hydrogen path.
10. The heating tube furnace can only be started after 10 minutes of hydrogen supply. Before heating, adjust the knob of the flow meter counterclockwise so that air bubbles in the Erlenmeyer flask appear at a rate of 2/sec.

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